The electric rotary gripper is a mechatronic end effector that combines gripping and rotation functions. It drives the gear or synchronous belt mechanism through the built-in servo motor to achieve synchronous rotation during the workpiece grasping process (such as screwing bottle caps and assembling gears). Its core consists of a motor, a reducer, a gripper mechanism, and a controller. It supports 360° rotation without dead angles and precise control of the rotation angle, and is suitable for scenes such as automated assembly lines and laboratory instrument operations.